Hydrogen embrittlement in compositionally complex FeNiCoCrMn FCC solid solution alloy

Journal Article · 31 January 2018 · Current Opinion in Solid State and Materials Science

DOI: https://doi.org/10.1016/j.cossms.2017.11.002 · OSTI ID:1427650

Nygren, K. E. ^[1]; Bertsch, K. M. ^[2]; Wang, S. ^[1]; Bei, H.  ^[3]; Nagao, A. ^[4]; Robertson, I. M. ^[5]

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1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
2. Univ. of Illinois, Urbana, IL (United States). Dept. of Materials Science and Engineering; Kyushu Univ. (Japan). International Inst. for Carbon-Neutral Energy Research
3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
4. Kyushu Univ. (Japan). International Inst. for Carbon-Neutral Energy Research; JFE Holdings, Inc., Tokyo (Japan). Steel Research Lab.,Materials Surface and Interface Science Research Dept.
5. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics and Dept. of Materials Science and Engineering; Kyushu Univ. (Japan). International Inst. for Carbon-Neutral Energy Research

The influence of internal hydrogen on the tensile properties of an equi-molar FeNiCoCrMn alloy results in a significant reduction of ductility, which is accompanied by a change in the fracture mode from ductile microvoid coalescence to intergranular failure. The introduction of 146.9 mass ppm of hydrogen reduced the plastic strain to failure from 0.67 in the uncharged case to 0.34 and 0.51 in hydrogen-charged specimens. This reduction in ductility and the transition in failure mode are clear indications that this alloy exhibits the classic signs of being susceptible to hydrogen embrittlement. The results are discussed in terms of the hydrogen-enhanced plasticity mechanism and its influence on hydrogen-induced intergranular failure. Furthermore, a new additional constraint that further promotes intergranular failure is introduced for the first time.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: JFE Holdings, Inc., Tokyo (Japan); Kyushu Univ. (Japan); Ministry of Education, Culture, Sports, Science and Technology (MEXT); National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Univ. of Wisconsin, Madison, WI (United States)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1427650
• Journal Information: Current Opinion in Solid State and Materials Science, Journal Name: Current Opinion in Solid State and Materials Science Journal Issue: 1 Vol. 22; ISSN 1359-0286
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English